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Doctoral Thesis
DOI
https://doi.org/10.11606/T.11.1980.tde-20230818-145333
Document
Author
Full name
Evandro Ferreira das Chagas
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 1980
Supervisor
Title in Portuguese
Uso de coletor de sucção no estudo da entomofauna em um pomar cítrico
Keywords in Portuguese
CITROS
COLETOR DE SUCÇÃO
ENTOMOFAUNA
POMARES
Abstract in Portuguese
Com o objetivo de conhecer-se o comportamento da entomofauna de um pomar de citros, Citrus sinensis Osbeck, instalado numa área de 5.000m2, aproximadamente, próximo do Departamento de Entomologia da Escola Superior de Agricultura “Luiz de Queiroz”, em Piracicaba, SP, usou-se um coletor de sucção portátil, modelo AS-ESALQ, como método de amostragem. As coletas foram efetuadas em 1977, semanalmente, ao acaso, de 10 plantas, por sucções do aparelho, em número de 20 e ao redor da copa de cada árvore. Dos resultados obtidos, conclue-se que o método de amostragem é válido para estudos de dinâmica populacional, dentro de uma cadeia alimentar de pragas e predadores de pequeno porte. Através das incidências identificadas, que constituíram a entomofauna do pomar de citros, selecionaram-se 132 espécies, das quais, 16,6% são predadores, 2,2% são pragas, 7,0% são pragas em potencial e 74,2% não estão associadas aos citros. A ordem Coleoptera é a mais representativa quanto ao número de espécies, sendo a família Coccinellidae a mais significativa no aspecto de controle biológico. Entre as espécies predadoras, Scymnus sp. é a que se mostrou mais abundante e esteve presente em todas as amostragens feitas. As espécies Aleurothrixus floccosus (Maskell, 1896) e Toxoptera citriaidus (Kirk., 1907), são as pragas mais importantes, ocorrendo durante todo o ano, com picos populacionais em abril e novembro. As interações A. floccosus e Nephaspis sp. A. floccosus e Saymnus sp., T. citriaidus e Scymnus sp., T. citricidus e Stethorus sp., são as mais expressivas na cadeia alimentar do ecossistema analisado.
Title in English
Not available
Abstract in English
This research was carried out to study the behavior of the entomofauna in a citrus orchard (Citrus sinensis Osbeck) located in the vicinity of the Department of Entomology of Escola Superior de Agricultura “Luiz de Queiroz” in Piracicaba, State of São Paulo, Brazil. A portable suction collector, model AS-ESALQ, was used as a sampling method. The collecting’s were done weekly at random, from ten plants, by sucking times round the crown of each tree. in 1977. The results indicated that the sampling method is valid for studying population dynamics of a food chain of small sized pests and predators. From the material obtained 132 species were selected and identified: 16.6% were predators, 2.2% were pests, 7.0% were potential pests and 74.2% were not associated to citrus. The Order Coleoptera was the most representative concerning the number of species and the Family Coccinellidae was the most significant in the aspect of biological control. Among the predators Saymnus sp. was the most abundant and present in all the samplings. The species Aleurothrixus floccosus (Maskell, 1896) and Toxoptera citricidus (Kirk., 1907) were the most important pests occurring all the year around with population peaks in April and November. The interactions A. floccosus and Nephaspis sp., A. floccosus and Saymnus sp., T. citricidus and Saymnus sp., T. citricidus and Stethorus sp., were the most expressive ones in the food chain of the ecosystem studied.
 
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Publishing Date
2023-08-18
 
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